import 'package:flutter/material.dart';

import '../api/api_client.dart';
import 'kontroll_screen.dart';
import 'scanner_screen.dart';

/// Prompt 11 Screen 1: Standort/Objekt wählen. Objekt-Code (Karte 10) →
/// Direktsprung ins Kontroll-Screen, sonst füllt der Scan dasselbe Suchfeld wie
/// manuelle Eingabe (Kamera fällt bei Etikettschaden auf Tippen zurück).
class ObjektListScreen extends StatefulWidget {
  const ObjektListScreen({super.key, required this.apiClient});
  final ApiClient apiClient;

  @override
  State<ObjektListScreen> createState() => _ObjektListScreenState();
}

class _ObjektListScreenState extends State<ObjektListScreen> {
  List<dynamic> _objekte = [];
  String _suche = '';
  String? _fehler;
  final _sucheController = TextEditingController();

  @override
  void initState() {
    super.initState();
    _laden();
  }

  @override
  void dispose() {
    _sucheController.dispose();
    super.dispose();
  }

  Future<void> _laden() async {
    try {
      final ergebnis = await widget.apiClient.request('/objekte');
      setState(() => _objekte = ergebnis as List<dynamic>);
    } catch (_) {
      setState(() => _fehler = 'Objektliste konnte nicht geladen werden.');
    }
  }

  Future<void> _scannen() async {
    final code = await Navigator.of(context).push<String>(
      MaterialPageRoute(builder: (_) => const ScannerScreen()),
    );
    if (code == null || !mounted) return;

    try {
      final objekt = await widget.apiClient.request('/objekte/code/$code');
      if (!mounted) return;
      Navigator.of(context).push(
        MaterialPageRoute(
          builder: (_) => KontrollScreen(
            apiClient: widget.apiClient,
            objektId: objekt['id'] as int,
          ),
        ),
      );
    } on ApiException catch (e) {
      if (e.status == 404) {
        _sucheController.text = code;
        setState(() => _suche = code);
      } else {
        setState(() => _fehler = 'Scan konnte nicht verarbeitet werden.');
      }
    }
  }

  @override
  Widget build(BuildContext context) {
    final gefiltert = _objekte.where((o) {
      final name = (o['name'] as String).toLowerCase();
      final code = (o['code'] as String).toLowerCase();
      final suche = _suche.toLowerCase();
      return name.contains(suche) || code.contains(suche);
    }).toList();

    return Scaffold(
      appBar: AppBar(title: const Text('Objekte')),
      body: Column(
        children: [
          Padding(
            padding: const EdgeInsets.all(12),
            child: Row(
              children: [
                Expanded(
                  child: TextField(
                    controller: _sucheController,
                    decoration: const InputDecoration(labelText: 'Suche oder Code…'),
                    onChanged: (wert) => setState(() => _suche = wert),
                  ),
                ),
                IconButton(
                  icon: const Icon(Icons.qr_code_scanner),
                  tooltip: 'Scannen',
                  onPressed: _scannen,
                ),
              ],
            ),
          ),
          if (_fehler != null) Text(_fehler!, style: const TextStyle(color: Colors.red)),
          Expanded(
            child: ListView.builder(
              itemCount: gefiltert.length,
              itemBuilder: (context, index) {
                final objekt = gefiltert[index];
                return ListTile(
                  title: Text(objekt['name'] as String),
                  subtitle: Text(objekt['code'] as String),
                  onTap: () => Navigator.of(context).push(
                    MaterialPageRoute(
                      builder: (_) => KontrollScreen(
                        apiClient: widget.apiClient,
                        objektId: objekt['id'] as int,
                      ),
                    ),
                  ),
                );
              },
            ),
          ),
        ],
      ),
    );
  }
}